• Weijing Wang, Xiaomei Tang, Hao Feng, Fenghui Sun, Lei Liu, Gary B Rajah, and Fengchun Yu.
• Department of Neurology, Beijing Haidian Hospital, Beijing Haidian Section of Peking University Third Hospital, Beijing, P.R. China.
• Medicine (Baltimore). 2020 May 29; 99 (22): e19801.

IntroductionChorea is considered a special complication of diabetes mellitus. Here we report a case of chorea associated with non-ketotic hyperglycemia (NKH).Patient ConcernsThe patient was a 79-year-old Asian woman. She had a history of type 2 diabetes mellitus more than 30 years, but with a poor control of blood sugar. She complained of acute onset of right limb involuntary activities, and being admitted to neurology department.DiagnosisThe patient was then diagnosed with NKH chorea.InterventionsIntravenous infusion of insulin was given to reduce blood glucose. Haloperidol was used to control motor symptoms.OutcomesHer symptoms improved quickly after treatment. In the past year, the patient's blood sugar was well controlled and her chorea did not recur.LessonsIf there are sudden abnormal movements in patients, in addition to thinking of chorea, hepatolenticular degeneration and other diseases, we should also pay attention to blood sugar, especially in diabetic patients with poor blood sugar control and negative ketone, we should consider the possibility of NKK chorea.ConclusionsNKH chorea is a special complication of diabetes.

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